Fixed: in the process of converting double byte characters (such as Chinese characters), the wrong buffer length was obtained.

(cherry picked from commit 06d5e0d)

Author: skyfish4tb

src/rtlib/strw_convfrom_str.c

@@ -61,7 +61,7 @@ FBCALL FB_WCHAR *fb_StrToWstr( const char *src )
     if( src == NULL )
         return NULL;
 
-    chars = strlen( src );
+    chars = mbstowcs( NULL, src, 0 );
     if( chars == 0 )
         return NULL;
 

src/rtlib/strw_convto_str.c

@@ -72,7 +72,7 @@ FBCALL FBSTRING *fb_WstrToStr( const FB_WCHAR *src )
     if( src == NULL )
         return &__fb_ctx.null_desc;
 
-    chars = fb_wstr_Len( src );
+    chars = wcstombs( NULL, src, 0 );
     if( chars == 0 )
         return &__fb_ctx.null_desc;